Replacement power supply for DAC
- Thread starter justinjgl
- Start date
@justinjgl
How'd the linear power supply work out for you?
How'd the linear power supply work out for you?
RVT1K
Super Member
I received the WL-DP01 50VA Ultra-Low Noise Linear PSU I ordered and have it powering my Schitt MODI 3 and Topping E50 II.
Nice and solid feeling and it came with cables -one USB C and one micro USB- so I didn't have to make anything.
My main goal was to eliminate as many wal-wart/USB power supplies as I could. I already have a 12V linear power supply that replaced the wal-warts that were powering my A/C Infinity fans and DSP-408.
That all has worked out great. But I don't hear any difference.
Nice and solid feeling and it came with cables -one USB C and one micro USB- so I didn't have to make anything.
My main goal was to eliminate as many wal-wart/USB power supplies as I could. I already have a 12V linear power supply that replaced the wal-warts that were powering my A/C Infinity fans and DSP-408.
That all has worked out great. But I don't hear any difference.
absolon
Super Member
The Studer 900 circuit is tested at 16:13 of this video. It is different than the ones that have been discussed so far.
justinjgl
New Member
"Studer 900" power supplies come in several forms online. The one in the video is a dual-positive or bipolar version. Here are another two which look quite different -
https://www.ebay.com/itm/115785562920
https://www.aliexpress.com/item/1005008481502787.html
The "Studer 900" power supply circuit historically uses a TL072 op-amp as error amplifier, zener diode (or LED) as voltage reference, and MJE15034 transistor as pass device.
There are "updated" designs which replace the zener diode with a TL431 transistor for better temperature stability. When I saw "TL431" in the description of justinjgl's power supply I assumed it was a Studer 900 type ... but confusingly, there are power supplies on AliExpress which utilise a TL431 in combination with an LM317 regulator, and optionally a final pass-transistor such as the TIP2955. These do not follow the Studer 900 design.
In hindsight I think justinjgl's power supply is this latter version.
absolon
Super Member
The one in the video is a split power supply for supplying positive and negative voltages to, for instance, op-amps that require both. That version is also available in a single supply. I'm not familiar with the one justinjlg acquired or any of the "updated" designs and the video only deals with the original and rates it quite highly.
No, as delivered that Studer900 board is 5V dual-positive output - Gabster mentions this in the video at 17:05.
It CAN be configured for bipolar output - Gabster mentions something about swapping connections for symmetrical output, but the official instructions here -
https://www.aliexpress.com/item/1005009386146203.html
say to bridge the "GND" solder pads, then use the VCC/GND/VSS connections.
absolon
Super Member
It is delivered as a kit and the board can easily be configured either way; I have four of them, all built as split supply given that every application requires both positive and negative voltage for the op-amps. Regardless of which way it is configured, the noise performance stays the same.
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ProudArmyBra
Active Member
Just make sure that any linear power supply you use is fully regulated to little or much voltage or current can fry equipment especially digital equipment! A lot of linear power supplies on the market in the audio world are not voltage or current limited and that is a recipe for destruction with low voltage digital designs.
justinjgl
New Member
I have tested the one I got, and the 5 volt output was a consistent 5 volt with a test load I put on at .2 A and 1.5 A
I've been so busy lately I have not had time to do a A-B audio sound test on my DAC and Streamer compared with the standard stock Wall Wart PS.
I've been so busy lately I have not had time to do a A-B audio sound test on my DAC and Streamer compared with the standard stock Wall Wart PS.
